The Bethesda Softworks Forums offer a DOOM 3 BFG Edition FAQ with more on the upcoming first-person shooter bundle (thanks Badboy). While this will include multiplayer support for all three DOOM games on consoles, PC gamers will not be given the chance to relive classic DOOM and DOOM II multiplayer:

What multiplayer is included for DOOM 3 BFG Edition?
ONLINE multiplayer for Xbox 360 and PS3:
DOOM: 2-4 players per map
DOOM II: 2-4 players per map
DOOM 3 and Resurrection of Evil: 2-4 players per map
Lost Mission: N/AOFFLINE multiplayer for Xbox 360 and PS3:
DOOM: 2-4 players per map
DOOM II: 2-4 players per map
DOOM 3 and Resurrection of Evil: N/A
Lost Mission: N/APC Multiplayer
On PC online Multiplayer for DOOM 3 and Resurrection of Evil is 2-8 players.
On PC there is no multiplayer options for Doom and Doom II.

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Beamer wrote on Sep 5, 2012, 19:50:The point is they're still selling it. It isn't free,

I never said it was free. You continue to ignore the last half of my post. Read my first post again. See where I wrote, "All of these games can also still be purchased on the PC inexpensively through digital distribution". I explicitly stated that the games were still for sale as one of the reasons why this re-release is not needed.

They're not selling something free.

No, they are repackaging their existing games and trying to pass them off to PC gamers as something new and improved when they are inferior to what already exists thanks to the source code release and the mod community. That is my point and what I tried to convey in the full text of my original post.

Freedoom is a fan made wad that uses all original content.

Freedoom is replacement wad set for Ultimate Doom and Doom 2 that would best be described as a "Doom-compatible" experience. It is designed to be used with Doom source ports to make them stand-alone games that are compatible with existing Doom 1 & 2 mods. In essence it is a legally free version of Doom 1 & 2.